/**
 * Custom pipe registry — extension point for companion packages.
 *
 * Companion packages (e.g. @maxhealth.tech/prefab-fhir) call
 * `registerPipe()` at import time to add domain-specific formatters.
 * Built-in pipes in applyFilter always take precedence over custom pipes.
 */
/** A pipe function receives the current value and optional arguments. */
export type PipeFn = (value: unknown, ...args: unknown[]) => unknown;
/**
 * Register a custom pipe filter.
 * Re-registration warns and overwrites (HMR-friendly).
 * Built-in pipes in applyFilter always shadow custom pipes.
 */
export declare function registerPipe(name: string, fn: PipeFn): void;
/** Remove a custom pipe (useful in tests). Returns true if it existed. */
export declare function unregisterPipe(name: string): boolean;
/** List all registered custom pipe names (useful for debugging). */
export declare function listPipes(): string[];
/** @internal — used by applyFilter to resolve custom pipes. */
export declare function getCustomPipe(name: string): PipeFn | undefined;
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